Apparatus for detecting faults in transparent objects
US4547067A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1983 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Dec 13, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/9018
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a detecting system adapted to detect foreign matters as faults of a glass bottle, between a projection path of a diffused light towards the object to be inspected and said object, a plane polarizing plate of a circular polarizer which includes the plane polarizing plate combined with a 1/4 wave plate is disposed at the side of a diffused light side, while, in a light path which causes light transmitted through the object to form an image on the photoelectric detector 6 through the lens, a detecting side circular polarizer which includes a 1/4 wave plate and a plane polarizing plate is placed. An output electric signal of the photoelectric detector is subjected to analog operation processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.